Re: kFreeBSD for Xen (and related lintian stuff)
El 2 d’abril de 2012 23:56, Steven Chamberlain <email@example.com> ha escrit:
> performance would be better by rebuilding with
> extra options from upstream's XENHVM configurations; these add drivers
> for optional paravirtualised disk/net devices, and Xen PCI passthrough,
> and also set the NO_ADAPTIVE_* options as an optimisation.
Any idea why these are not in GENERIC? What are the drawbacks?
I think this would be better discussed with upstream.
> Unlike for the other kFreeBSD flavours, the xen.config includes
> upstream's own XEN config file rather than being a copy of it.
Please take kfreebsd-10 as reference, they all use includes there.
> In the
> included file is 'DEBUG=-g', which results in a kernel.symbols file
> being generated. Lintian flags the file as an
> 'unstripped-binary-or-object' and also (presumably a false detection) as
> A -DWITHOUT_KERNEL_SYMBOLS was added to both kfreebsd-8 and kfreebsd-9.
> possibly as a workaround for this.
KERNEL_SYMBOLS is the knob intended for user to select this. Note
that DEBUG can be set in many places, config file is not the only one.
> (actually, I think setting WITHOUT_KERNEL_SYMBOLS to some
> value other than 'no' will cause the issue to recur...).
This is not how make knobs work. See:
> The upstream XEN config file contains MODULES_OVERRIDE="", causing no
> modules to be built at all for the "xen" flavour. I don't see a reason
> to disable all modules like that, because some would be still useful.
Does module loading work on XEN flavor? On PAE it was disabled
because it doesn't.
Again I think this would be better discussed with upstream.
> The "xen" flavour of both kernel series has WITNESS and WITNESS_SKIPSPIN
> options enabled which I think are supposed to be turned off for release
Are you sure? What about:
# disable extra checks enabled in upstream XEN config
nooption INVARIANTS # Enable calls of extra sanity checking
nooption INVARIANT_SUPPORT # Extra sanity checks of
internal structures, required by INVARIANTS
nooption WITNESS # Enable checks to detect
deadlocks and cycles
nooption WITNESS_SKIPSPIN # Don't run witness on
spinlocks for speed
> Once I have my Xen host system (hopefully tomorrow) I should be able to
> properly test and provide diffs to fix some of the above issues.
Thanks for looking into this!